Antifriction alloy



'rarns area since.

ANTIFRICTION ALLOY.

SPECIFICATION forming part of Letters Patent No. 579,396, dated March 23, 1897. Application fil rl December 4, 1896. $e1'ial No. 614,457. (No specimens.)

To all whom it may concern.-

Be it known that I, WILLIAM HERMAN KEM- LER, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Antifriction Alloys, of which the following is a full, clear, and exact description.

I have discovered that a very useful antifriction metal can be made of an alloy containing copper, aluminium, tin, and zinc, the tin being in excess of the zinc and the zinc in excess of the other metals. The preferred proportions are about as follows: copper, three per cent. aluminium, five per cent. tin, sixty-five per cent. 5 zinc, twenty-seven per cent. An alloy of these proportions is the best antifriction metal for general use for rollingmills, dynamos, and high-speed machinery generally. It has a distinctive appearance, like chased silver. It melts easily, runs freely, and casts well in sand molds Without blowholes and with little shrinkage. It is lubricant in nature, light in weight, ductile, and of high crushing resistance. In melting it I prefer to add sal-amrnoniac and to stir it after fusin to clear it from dross.

\Vithin the scope of the broader claims of this specification the proportions may be varied. For example, I may vary the several ingredients as follows: copper, one to five per cent; aluminium, two to six per cent; tin, forty to sixty-five per een t. zinc, twenty-five to fifty-five per cent.

Increasing the Zinc and diminishing the tin makes a harder alloy and of higher fusingpoint.

I claim 1. An alloy containing copper, aluminium, tin and zinc, the tin being present in greater proportion than the zinc and the zinc in greater proportion than the others.

2. An alloy containing copper, aluminium, tin and zinc in about the following proportions: copper three per cent, aluminium, five per cent, tin sixty-five per cent. zinc twentyseven per cent.

In testimony whereof I have hereunto set my hand.

WVILLIAM HERMAN KEMLEE.

IVitnesses:

G. I. Honnsnrr, THOMAS W. BAKEWELL. 

